[Docs] - Build website on every PR (Resolves #2661) (#2667)

Author: angelosilvestre

.github/workflows/pr_validation.yaml

@@ -308,3 +308,25 @@ jobs:
 
       # Run all tests
       - run: dart test
+
+  build_docs_websiste:
+    # Run this job only when the PR is targeting the main branch
+    if: ${{ github.base_ref == 'main' }}
+    runs-on: ubuntu-latest
+
+    defaults:
+      run:
+        working-directory: ./doc/website
+
+    steps:
+      # Checkout the PR branch
+      - uses: actions/checkout@v3
+
+      # Setup Dart environment
+      - uses: dart-lang/setup-dart@v1
+
+      # Download all the packages that the app uses
+      - run: dart pub get
+
+      # Build the static site
+      - run: dart run bin/super_editor_docs.dart